Abstract: A steel mill uses "KR hot metal desulfurization→90 t converter blowing →LF refining →RH refining→150 mm×150 mm billet continuous casting" process for industrial production of 09CuPCrNi weathering Steel（/%： 0.07-0.13C， 0.35-0.65Si， 0.70-1.00Mn， 0.065-0.150P，≤0.010S， 0.10-0.30Ni， 0.30-0.70Cr， 0.15-0.40Cu，≤0.040Al）. By the converter adopts a low slag content of 19 kg/t with a total amount of lime and dolomite， and the final slag binary alkalinity is controlled at 2-3 low alkalinity slag making. The low gun position blowing process with a blowing oxygen gun position of about 1.3 m achieves an endpoint w［P］ ≥ 0.065% . The refining process adopts aluminum strong deoxidation ， slag surface composite deoxidation to control the alkalinity of the refining slag by 7-9 and the calcium treatment of the ending of RH vacuum treatment and continuous casting weak cooling and other process measures successfully developed 09CuPCrNi weathering Steel . It has chemical composition stability and non-metallic inclusion level A≤1.0 grade， B≤1.5 grade， C ：0 grade ， D≤1.0 grade ， DS≤1.5 grade and high cleanliness. There are no cracks on the surface and low magnification of rolled products. The grain size>6 levels and all indicators meet the technical requirements.

Key words: Weathering Steel, Converter Blowing, Low Alkalinity, Calcium Treatment, Cleanliness

摘要： 某钢厂采用“KR铁水脱硫→90 t转炉→LF精炼→RH精炼→150 mm×150 mm方坯连铸”工艺流程工业化生产耐候钢09CuPCrNi（/%：0.07～0.13C，0.35～0.65Si，0.70～1.00Mn，≤0.010S，0.065～0.150P，0.10～0.30Ni，0.30～0.70Cr，0.15～0.40Cu，≤0.040Al）。通过转炉采用石灰和白云石总用量19 kg/t的少渣量、终渣二元碱度控制在2～3的低碱度造渣、吹炼氧枪枪位1.3 m左右的低枪位吹炼工艺，实现终点w［P］≥0.065%。精炼过程采用铝强脱氧及渣面复合脱氧，控制精炼炉渣碱度7～9，RH真空处理结束钙处理，连铸弱冷冷却等工艺措施，成功开发09CuPCrNi耐候钢，化学成分稳定，非金属夹杂物级别A类细≤1.0级、B类细≤1.5级、C类细0级、D类细≤1.0级、DS≤1.5级，洁净度高，轧材表面及低倍无裂纹，晶粒度6级，各项指标满足技术要求。

关键词: 耐候钢, 转炉吹炼, 低碱度, 钙处理, 洁净度